Attachment for lathes



UNITED STATES :PATENTQFiiC/ JOHN w. ALLEN, AOE HARTFORD, CONNECTICUT. i f i .Y "ATTAC HM ENTV O R LATI-i Es; 4f

SPECIFICATION forming part of Letters Patent No. 381,O97,datec'izAp1-i1 1,7, 18S-8;.;A .l i. l

Application meu July 1, issu. .seriaiNojziaosa (No model.)

To a/ZZ whom, itmay concern:

Be it known that I, JOHN W. ALLEN, of the rcity and county of Hartford, Gonnec'ticuuhave invented a new and' useful yAttachment forv 1o lathes having quick-working center-points,

Aconsists of a centering device in combination with mechanism whereby that device may bemanipulated conjointly with/thev dead-,center of the lathe'to which theinvention is applied.

The best mode in which I have contemplated applying the principleof m y inventionis shown Y in said drawings, in which- Figurel is a side view of the foot-block of a lathe and its appurtenances, including the cen- 2o tering devicev and other mechanism which con- Y usual manner.,V The spindle in Fig. 1 is mal Y 3o nipulated by a hand-wheel, "5, vin the usual stitute my said invention. Fig. 2 is a modification of Fig. 1. Figs. 3 and 4 are another mdificationof Fig. 1, and Fig. 5 is a detail; In the views, the numeral 1 denotes thefootblock'of a lathe, which is of any ordinary or' convenient form and is adapted to lathe-work of any desired description. Block 1 is provided with dead-center 2 and spindle` 4, `in the manner,and 'is provided with a fixed spool, 6,-

for engagement withlever 12, hereinafter men-l tioned. Block 1 is perforatedlongitudinally by a slot which accommodates a sliding bar, 7.-

35 The latter bends upward at the frontend and terminates in a rest, which is shown in detail in Fig. 5.v This rest consists of twobranches,

' Sand y9, which are `providedwith screws I0. I The latter may be set in desired positions for 4o the purpose ofv receiving upon their points a succession of blanks,11, of uniform size and shapein a predetermined position, in which l they will be duly centered by the advance of point 2, as hereinafterdescribed. y,

,45 In Fig. 1 spindle 4 and bar 7 are connected f together by'a lever, 12, which is pivoted in-a bracket, 13, projecting from the rear ofblock 1. The upper and shorter arm of. said lever bifurcates about spool 6 and is armed with two 5o pins, whichenter the vacant space between the two cheeks of spool 6. vOne of said pins is seen at 21.-* Thus theshort arm of lever 12 v'engages spindle 4. "Ihe loweran'd limger,armA` of lever 12 is pivoted in the splitendof armi? `by means of slot and pin at 14. .i

A In the modicat'ions which areshown in Figs. 2, 8, and 4spiudle 4,being`gprovided-' vwith aterminal eye, 16, islmanipu'latedybyw means of a weighted lever-handle',f1f[, 'pivoted f in bracket 13, andcarrying an eccentric, I18N,-

which plays in eye 16. vIn the' modiflicatioln which is shown in Fig. 2, lever.l7f;;a `nd VVbar7 .l arewconnected by a link, 19. ,In'fthemod'ilcaj tion which is shown in Figs. 'Sand 4-levlerf'1j7 is connected with a terminal arm,'20,"which turns lupwardwfrombar 7, as seen insaid fig-f ures. The engagement between arm 20 'andr lever 17 is yeffected by means of a pin, '22

3 and 4.

involved in this invention'sufcientlyfappear .which enters a slot in .arm 20,\as seein in Figs.

from the'drawings and from the mode of op. v. l

eration,which`is as follows: In the instance of Fig. 1, the dead-center 2`is' withdrawn for the reception of blank llby-turning handwheel 5. Inthe instances ofv Figs. 2 and, the' sameresult is producedby carryi'ngthe lever-V handle to the positionv shown in those figures.

When the dead-center is so withdnrawmthe rest occupiesv a position in advance of the deadadj usted for blanks of any desired size by turnthat a blank ofthat size,when placed in contact v center, as shown in Figs.. 1, 2, and 3. f The rest is i with said screws in the'positionshown -in Figs.

1, 2, and 3, is "in position Ato receive thecenter-.point 2, as seen in those lfigures. y'Ilne blank is then placed in itsv predetermined position before the dead-center andin ,contacty with screws l0, and `the dead-'center is advanced by` the manipulationof hand-.wheel `5"or hand-lever 17, as the case may be, untiltheblank is duly center-punched, as seen in Fig. 4. In Fig.

1 the forward motion of the spindle involved in the operation just described is converted by`| lever 12 into a. backward motion of bar 7, whilev in the remaining views a like result'is produced by means of the engagement of lever v17 with bar 7 throughlinkli) 0r arm 20'a`s the 'case may be. fIn like manner theA backward `motion of the spindle, whenthe center-.point vroo' is withdrawn from the work, is reversed in bar iv .7. In all of thesey cases the motionuof bar 7-is greater than that of the centerpoint; hence it follows that while the center-pointadvances the centeringdevice, retiring at a more rapid rate, reaches a position shown in Fig. 4, where it is never in the Way of the blank during the turning.

I claim as my invention and desire to secure by Letters Patent- 1. A footblock and spindle of a lathe, a centering device, and a sliding bar carrying said centering device, in combination with a lever connecting said bar and spindle and pivoted between them, substantially as and for the purpose specified. i

2. A foot-block, spindle, and Ydead-center of a lathe, a centering device, and a sliding bar carrying said centering device, in combination with a link and lever which connect said bar and spindle, substantially as and for the purpose specified. y

3. A foot-block, spindle, and dead-center of a lathe, a rest for holding blanks in position to take the dead-center, and a sliding bar carrying said rest, inl combination with a lever which is provided with a cam engaging said spindle, substantially as and for the purpose specified.

4. In alathe, a foot-block, a spindle, a deadcenter, a rest, and a sliding bar carrying said pivoted in a bracket upon said block and is` adapted to impel said bar and spindle simultaneously in opposite directions, substantially as and for the purpose specified.

Arestin combination with a lever which is 30 5. A foot-block, a spindle, and a dead-cen- 35 ter of a lathe, and a rest for holding blanksin position to take said dead-center, in combination with a lever connected with said bar and an angle with each other, and are provided 45 with screws for contact with said blanks, substantially as and for the purpose specified.

In testimony whereof I have hereunto set my name in the presence of two witnesses.

JOHN W`. ALLEN.

Witnesses:

WILLARD EDDY, WILLIAM E. BEEBE. 

